docs/esp32c6: Remove sotest docs esp32c6 docs/esp32c3: Add spiflash docs esp32c3 docs/esp32c3: Remove sotest docs esp32c3 docs/esp32h2: Add spiflash docs esp32h2 docs/esp32h2: Remove sotest docs esp32h2
Add documentation about the RMT peripheral (and using it to drive WS2812 addressable RGB LEDs) for ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2.